Knurling tool



April 5, 1927. 1,623,662

G. W. DOVER KNURLING TOOL Filed Dec,l 24, 1924 cfmW-w//IR g wi# Y A TTDHNE Y:

Patented Apr. 5,` 1,927. y

UNITED STATES esoneri W. Doven, or LONGMEADOW, RHODE isLAND, Assrenon ToTHE iiroiv'rcioirciiisnr l 1,623,662 PAifiszni" loi-fricE.

TOOL` .AND MACHINERY COMPANY, A CGRPRATION `0I? RHODE ISLAND.

KNURLING- TOOL. i

i This invention relates to an improved knurling tool for use in connection With lathes and the like to knu'rl materia-l in a l novel manner and at a ksingle operat-ion.

Tools of this character as heretofore made and used 4require an initital and repeated thrust or jam against and into the work, which involves increased expensel in operation as Well aseXcessive pressurey upon the Work. f f

\ One object ofthe present inventionis the provision of rollers having beveled. edges, the edge port-ions of which I are provided with knurling teeth as Well as the central portions of the peripheries, whereby the knurling rollers may be set initially to cut knurls of the desired depth and the Work may then be fed in front of the rollers to cut the knurls of the `desired depth at a single operation. v i

iA further object of the. invention is tov provide a tool of this character wherein the shank portion is provided With a shoulder adapted to support the roller carrier cage whereby the parts are firmly held against `movement ofthe carrier cage relative to the tool shank during use.

@ther objects and advantages of the invention relate to various details of construetion and modes of operation as Will be more fully set forth iii the detailed description to follow.

ln the accompanying ldrawings' which form a part of this application@i Fig. 1 is a side elevation of aknurling tool embodying my. invention,

F ig.2, a plan view of the same,

Fig.`3, a section on line 3 3 of Fig. 2,

Figs. 4 and 5, a side and an edge elevation respectively of one of the knurling rolls, and,

Fig. 6, a fragmentary section of the same on line 6-6 of 5.

Like reference characters indicate 'like parts throughout the views.

In the drawings 7 is a tool shank provided at one end With an enlarged rounded portion 9 of reduced thickness as at 10 forming a recess and a resultant curved shoulder 11.v The `portion 9 has a central opening 13. comprises. a hub 16 having spaced Webs or flanges 17 provided With Vperipheral shoulders or arms 18 spaced .from each other and having curved `outer edges. Fast `in each The cage .or carrier-head kv arm, side by side, are-pins 20l which pass loosely through central holes 21 in'knurling rollers 22.. The hub 16 has a sliding fit in the opening 13v and terminates in a stem24 provided With av thread 25 engaging the thread 26 of `binding nut 27 Whose Washer 28`abuts-against the face of the enlargenient 9. The carrier head 15 lits Wit-hin the recess 10 so that the shoulder 11 forms an.

its ample face bearing prevents excessive strain. i

Each knurling roller 22 has an elevated central peripheral portionl 30 and inclined peripheral edge portions 31; and transversely'disposed upon the peripheral portions, preferably diagonally, are a series of piercing teeth 33, V shaped in cross section whichy extendacross the central peripheral portion and the inclined lateral edges of each roller. The vcentral portion 34 of each tooth is,l therefore, elevated and parallel Withk theaxialline of `the roll, While both Vend portions35 of the teeth are inclinedto Wardstlie faces of the roll. .y

ln ythe operation of the tool in knurling,

the Work to be knurled, Which is indicated by the numeral 37 and Which is supported along t-he center line of the lathe, is advaneed to a position opposite the knurling tool. Thereupon the locking nut 27 is loosened and the tool advanced unt-il tivo of the knurling rollers 22 contact with the Work as shown-in Fig. 1 thus properly posi-y tioning the carrier head relative 'to the tool shank 7. The nut 27 is then tightened to firmly lock the carrier `head 15 to the shank 7.

The Work 37 is then Withdrawn from in front of the knurling rollers 22 and the tool Knurlinfbr rollers have always been made heretofore with square shoulders which necessitated the 4positioning` of the work in front of the rollers and then jamming the rollers into the work before commencing` the knurling operation.

By means of my improved construction the operation is completed by a single traverse ot the work and less pressure is required upon the tool.

The construction of the shank 7 provided With a recess l0 and shoulder 11 against which the carrier-head bears transfers the strain upon the knurling rollers directly to the shank 7, and the manner of securing the carrier-head to the tool shank 7 is Such as to securely hold the carrier-head against movement.

What I claim is 1. A knnrling tool provided with cooperatingrollers having inclined edges, said roll ers being provided with teeth extending across said inclined edgesand the central portions of the peripheries thereof, whereby the knurling rollers may be set to cut knurls of the desired depth at a single operation.

Q. A knurling tool comprising?r a shank portion provided with a lateral recess, a shoulder on said shank adjacent to said recess, a carrier-head fixedly secured to said shank and having a portion thereof extending within said recess and bearing against said shoulder, and knurling rollers supported by said carrier-head said rollers being provided with teeth extending across said inclined edges and the oentrai portions of the peripheries thereof, whereby the knurling rollers ma)v be set to cnt knnrls ol the desired depth at a single operation.

3. A knurling tool comprising' a shank portion provided with an opening, a carrier head having a hub portion litting within the opening in said shank`r means 'tor drawingr Jthe hub ot said carrier-head within theopening in said shank to firmly clamp said carrierhead against the shank and prevent relative movement ot' said carrier-head and shank, and knurling rollers supported by said carrier-head said rollers being provided with-teeth extendingacross said inclined edges and the central portions ot.' the peripheries thereot, whereby the knuriine' rollers may be set to cnt knurls oil the desire'l depth at a single operation.

et. A knrnling tool comprisingl a shank portion, a carrier-head supported by said shank portion, said carrier-head comprising a central hub provided with radial arms, and knul-lingr rollers operatively mounted in said arn'is, said rollers bein.;r provided with inclined edges and having' teeth extendinfY across said inclined edges and the central portions oi the peripheries thereof.

5. A knurline' tool provided with cooper ating rollers haring inclined edges.` and teeth extending diagonally across the inclined edges and the central portion of the peripheries ot said rollers, whereby the. knurling' rollers may be set to cut knnrls ol' the desired depth at a single operation.

In testimony whereof I have aliixed my signature.

GEORGE lV. DOVER. 

